what year truck?
mine are 85's

the 85's have a different arm then the newer one's.

I have:
taken the lever out and pried the metal, rusty lining out of them. leaves them loose. I used a drill bit to help cut through the metal. don't drill or damage the pot metal to much!

also taken the newer pivots and replaced the arm with the one from the 85.
the newer one's don't have the metal sleave in them that I can tell.